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diff --git a/comm/mail/test/browser/keyboard/browser_spacehit.js b/comm/mail/test/browser/keyboard/browser_spacehit.js
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+++ b/comm/mail/test/browser/keyboard/browser_spacehit.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Tests that the space bar only advances to the next unread message
+ * when mail.advance_on_spacebar is true (default).
+ */
+
+"use strict";
+
+var {
+  be_in_folder,
+  create_folder,
+  get_about_message,
+  make_message_sets_in_folders,
+  mc,
+  select_click_row,
+  wait_for_message_display_completion,
+} = ChromeUtils.import(
+  "resource://testing-common/mozmill/FolderDisplayHelpers.jsm"
+);
+
+// Get original preference value.
+var prefName = "mail.advance_on_spacebar";
+var prefValue = Services.prefs.getBoolPref(prefName);
+
+add_setup(async function () {
+  // Create four unread messages in a sample folder.
+  let folder = await create_folder("Sample");
+  await make_message_sets_in_folders([folder], [{ count: 4 }]);
+  await be_in_folder(folder);
+});
+
+registerCleanupFunction(function () {
+  // Restore original preference value.
+  Services.prefs.setBoolPref(prefName, prefValue);
+});
+
+/**
+ * The second of four simple messages is selected and [Shift-]Space is
+ * pressed to determine if focus changes to a new message.
+ *
+ * @param {boolean} shouldAdvance - Whether the selection should advance.
+ * @param {boolean} isShiftPressed - Whether to press Shift key.
+ */
+function subtest_advance_on_spacebar(shouldAdvance, isShiftPressed) {
+  // Set preference.
+  Services.prefs.setBoolPref(prefName, shouldAdvance);
+  // Select the second message.
+  let oldMessage = select_click_row(1);
+  wait_for_message_display_completion(mc);
+  // Press [Shift-]Space.
+  EventUtils.synthesizeKey(
+    " ",
+    { shiftKey: isShiftPressed },
+    get_about_message()
+  );
+  // Check that message focus changes if `shouldAdvance` is true.
+  let newMessage = get_about_message().gMessage;
+  shouldAdvance
+    ? Assert.notEqual(oldMessage, newMessage)
+    : Assert.equal(oldMessage, newMessage);
+}
+
+/**
+ * Test that focus remains on current message when preference is false
+ * and spacebar is pressed.
+ */
+add_task(function test_noadvance_on_space() {
+  subtest_advance_on_spacebar(false, false);
+});
+
+/**
+ * Test that focus remains on current message when preference is false
+ * and shift-spacebar is pressed.
+ */
+add_task(function test_noadvance_on_shiftspace() {
+  subtest_advance_on_spacebar(false, true);
+});
+
+/**
+ * Test that focus advances to next message when preference is true
+ * and spacebar is pressed.
+ */
+add_task(function test_advance_on_space() {
+  subtest_advance_on_spacebar(true, false);
+});
+
+/**
+ * Test that focus advances to previous message when preference is true
+ * and shift-spacebar is pressed.
+ */
+add_task(function test_advance_on_shiftspace() {
+  subtest_advance_on_spacebar(true, true);
+});